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authorPaolo Abeni <pabeni@redhat.com>2020-10-27 15:59:14 +0100
committerJakub Kicinski <kuba@kernel.org>2020-10-29 11:27:14 -0700
commit9c3f94e1681bb0ebd93390f014082042d8bc067a (patch)
tree61b897510cac8a13a54ead2387804788bbe30ef1 /net
parentceb1eb2fb609c88363e06618b8d4bbf7815a4e03 (diff)
downloadlinux-stericsson-9c3f94e1681bb0ebd93390f014082042d8bc067a.tar.gz
mptcp: add missing memory scheduling in the rx path
When moving the skbs from the subflow into the msk receive queue, we must schedule there the required amount of memory. Try to borrow the required memory from the subflow, if needed, so that we leverage the existing TCP heuristic. Fixes: 6771bfd9ee24 ("mptcp: update mptcp ack sequence from work queue") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Link: https://lore.kernel.org/r/f6143a6193a083574f11b00dbf7b5ad151bc4ff4.1603810630.git.pabeni@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/mptcp/protocol.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 185dacb39781..e7419fd15d84 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -274,6 +274,15 @@ static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
skb_ext_reset(skb);
skb_orphan(skb);
+ /* try to fetch required memory from subflow */
+ if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
+ if (ssk->sk_forward_alloc < skb->truesize)
+ goto drop;
+ __sk_mem_reclaim(ssk, skb->truesize);
+ if (!sk_rmem_schedule(sk, skb, skb->truesize))
+ goto drop;
+ }
+
/* the skb map_seq accounts for the skb offset:
* mptcp_subflow_get_mapped_dsn() is based on the current tp->copied_seq
* value
@@ -301,6 +310,7 @@ static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
* will retransmit as needed, if needed.
*/
MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_DUPDATA);
+drop:
mptcp_drop(sk, skb);
return false;
}